I favor methods to make Linux more accessible to the average user. And part of that accessibility also means being able to run some of the programs one is used to running in Windows, so they don't have to give up their old software, at least not right away. When they're ready to upgrade, either there will be Linux native ports of their favorite applications, or they'll move on to Linux native applications.
Of course, this could also mean vendors will never make a Linux native port, since they apparently can run Windows software so well. But if Windows starts getting used less and less, and Linux more and more, I think it will be likely that vendors will port to Linux natively.
There is one major advantage of Xandros over Lindows, though. You still set up user accounts when installing, rather than doing everything as root like Lindows does.